docs(tritrpc): point capability-fabric semantics to canonical standards source

docs/CAPABILITY_FABRIC_SEMANTIC_SOURCE.md

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+# Capability Fabric Semantic Source Pointer
+
+`TriTRPC` is the **transport authority** for deterministic ternary-native RPC framing, fixtures, and wire-level interoperability.
+
+## Scope in this repository
+
+This repository MAY define or evolve:
+- transport framing
+- canonical byte encoding
+- envelope ordering
+- AEAD / AAD boundaries
+- fixture and verifier behavior
+- generic typed-blob carriage and digest/signature/reference mechanics
+
+This repository MUST NOT redefine the canonical semantic core of the Capability Fabric.
+
+## Canonical semantic source of truth
+
+The protocol-independent Capability Fabric semantics live in:
+
+- `SocioProphet/socioprophet-standards-knowledge`
+  - `docs/standards/040-capability-fabric-core.md`
+  - `docs/standards/041-capability-fabric-realization-profiles.md`
+  - `docs/standards/042-capability-fabric-delivery-and-receipts.md`
+  - `docs/standards/043-capability-fabric-controllability-and-proof-strength.md`
+  - `schemas/jsonschema/capability-fabric/`
+
+## Wire-clean rule
+
+`TriTRPC` MAY carry capability-fabric objects as typed payloads, references, digests, signatures, or attestations.
+
+`TriTRPC` MUST NOT redefine or embed the canonical meaning of:
+- `FunctionIdentity`
+- `CapabilitySignature`
+- `EffectContext`
+- `InteractionMode`
+- `DeliverySemantics`
+- `ReceiptSemantics`
+- `ExecutionControllabilityProfile`
+- `ProofStrengthProfile`
+- `RealizationMetadata`
+
+These semantics MUST be imported or referenced from the canonical standards source rather than re-specified here.
+
+## Intended follow-on work
+
+Future transport-facing work in this repository MAY describe:
+- how capability-fabric objects are carried as typed blobs or attachments
+- how digest and signature refs bind those objects to wire envelopes
+- how fixtures and deterministic verifiers confirm transport-level carriage without changing semantic meaning